1. Key Laboratory for Biomechanics and Mechanobiology Beijing Advanced Innovation Center for Biomedical Engineering School of Biological Science and Medical Engineering Beihang University Beijing 100083 China
2. Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA
3. School of Biological Sciences Nanyang Technological University Singapore 639798 Singapore
4. Department of Mechanical Engineering University of Michigan Ann Arbor MI 48109 USA